6. Control Functions and Parameter Settings
6-51
Other restrictions related to the pump’s ON/OFF control are given below.
(6) When the PID output reaches LLT, the pumps will sequentially turn OFF from the
pump having the longest operation time. However if there are no pumps to turn OFF,
the VAT2000 will stop. When the PID output rises and leaves LLT, the VAT2000 will
resume operation
O N
(6 )
O N
O N
S top
R e start
O pe ra tio n
tim e
T1
L LT
P ID O utpu t
P S O 1
(p um p 1)
P S O 2
(p um p 2)
P S O 3
(p um p 3)
T1
T1
T1
VAT20 0 0
VAT2000 automatic operation (three ON/OFF control pumps)
(7) When the operating VAT2000’s command (RUN) turns OFF, all commands for the
pump function will simultaneously turn OFF.
(8) If a fault occurs in the inverter, the following operation will take place.
•
As long as the operating command RUN is held in ON state, the pump´s control
ON/OFF will be held. Equalisation of each pump´s operation time will also be
continued.
•
When the operating command RUN turns OFF, all commands for the pump will
simultaneously turn OFF.
(9) When the inverter’s power is turned OFF, the operation time history for each pump will
be lost.
2) Preparation
for
operation
(1) Set the number of pumps to be ON/OFF controlled in parameter B44-0.
One to five pumps can be set. The relation of the pump No. recognised in the inverter
and the output terminals is as follows.
PUMP No.
Relay output terminals
1
PSO1
2
PSO2
3
Standard
PSO3
4
PSO4
5
Option
PSO5
The pumps are started in the order of pump No. 1 to 5.
The digital outputs not being used for ON/OFF control can be used as normal
programmable outputs.
